Java平台使用了一个Poperties对象来维护其自己的配置信息。System泪中包含有一个Properties对象用于描述当前工作环境的配置。系统properties包含了关于当前用户、当前Java运行时版本、文件路径分隔符等信息。
| Key | Meaning |
|---|---|
"file.separator" |
Character that separates components of a file path. This is "/" on UNIX and "\" on Windows. |
"java.class.path" |
Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property. |
"java.home" |
Installation directory for Java Runtime Environment (JRE) |
"java.vendor" |
JRE vendor name |
"java.vendor.url" |
JRE vendor URL |
"java.version" |
JRE version number |
"line.separator" |
Sequence used by operating system to separate lines in text files |
"os.arch" |
Operating system architecture |
"os.name" |
Operating system name |
"os.version" |
Operating system version |
"path.separator" |
Path separator character used in java.class.path
|
"user.dir" |
User working directory |
"user.home" |
User home directory |
"user.name" |
User account name |
实际数据：
public static void main(String args[]) {
System.out.println("java_vendor:" + System.getProperty("java.vendor"));
System.out.println("java_vendor_url:" + System.getProperty("java.vendor.url"));
System.out.println("java_home:" + System.getProperty("java.home"));
System.out.println("java_class_version:" + System.getProperty("java.class.version"));
System.out.println("java_class_path:" + System.getProperty("java.class.path"));
System.out.println("os_name:" + System.getProperty("os.name"));
System.out.println("os_arch:" + System.getProperty("os.arch"));
System.out.println("os_version:" + System.getProperty("os.version"));
System.out.println("user_name:" + System.getProperty("user.name"));
System.out.println("user_home:" + System.getProperty("user.home"));
System.out.println("user_dir:" + System.getProperty("user.dir"));
System.out.println("java_vm_specification_version:" + System.getProperty("java.vm.specification.version"));
System.out.println("java_vm_specification_vendor:" + System.getProperty("java.vm.specification.vendor"));
System.out.println("java_vm_specification_name:" + System.getProperty("java.vm.specification.name"));
System.out.println("java_vm_version:" + System.getProperty("java.vm.version"));
System.out.println("java_vm_vendor:" + System.getProperty("java.vm.vendor"));
System.out.println("java_vm_name:" + System.getProperty("java.vm.name"));
System.out.println("java_ext_dirs:" + System.getProperty("java.ext.dirs"));
System.out.println("file_separator:" + System.getProperty("file.separator"));
System.out.println("path_separator:" + System.getProperty("path.separator"));
System.out.println("line_separator:" + System.getProperty("line.separator"));
}
输出：
java_vendor:Oracle Corporation java_vendor_url:http://java.oracle.com/ java_home:/Library/Java/JavaVirtualMachines/jdk1..0_79.jdk/Contents/Home/jre java_class_version:51.0 java_class_path:/Users/awp/Documents/otherproject/MyJmeterDemo/bin:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/ApacheJMeter_core.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/ApacheJMeter_java.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/jorphan-.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/avalon-framework-api-.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/ApacheJMeter_http.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/oro-.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/commons-io-.jar:/Users/awp/Documents/otherproject/MyJmeterDemo/libs/xstream--SNAPSHOT.jar os_name:Mac OS X os_arch:x86_64 os_version: user_name:awp user_home:/Users/awp user_dir:/Users/awp/Documents/otherproject/MyJmeterDemo java_vm_specification_version:1.7 java_vm_specification_vendor:Oracle Corporation java_vm_specification_name:Java Virtual Machine Specification java_vm_version:24.79-b02 java_vm_vendor:Oracle Corporation java_vm_name:Java HotSpot(TM) -Bit Server VM java_ext_dirs:/Users/awp/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1..0_79.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java file_separator:/ path_separator:: line_separator: